The XRecolorCursor function changes the color
of the specified cursor, and if the cursor is being displayed on a screen,
the change is visible immediately. The pixel members of the XColor structures
are ignored; only the RGB values are used.

XRecolorCursor can generate
a BadCursor error.

The XFreeCursor function deletes the association
between the cursor resource ID and the specified cursor. The cursor storage
is freed when no other resource references it. The specified cursor ID should
not be referred to again.

XFreeCursor can generate a BadCursor error.

Some displays allow larger cursors than other displays. The XQueryBestCursor
function provides a way to find out what size cursors are actually possible
on the display. It returns the largest size that can be displayed. Applications
should be prepared to use smaller cursors on displays that cannot support
large ones.